Optical wireless communication (OWC) is considered to be a promising technology which will alleviate traffic burden caused by the increasing number of mobile devices. In this study, a novel vertical-cavity surface-emitting laser (VCSEL) array is proposed for indoor OWC systems. To activate the best beam for a mobile user, two beam activation methods are proposed for the system. The method based on a corner-cube retroreflector (CCR) provides very low latency and allows real-time activation for high-speed users. The other method uses the omnidirectional transmitter (ODTx). The ODTx can serve the purpose of uplink transmission and beam activation simultaneously. Moreover, systems with ODTx are very robust to the random orientation of a user equipment (UE). System level analyses are carried out for the proposed VCSEL array system. For a single user scenario, the probability density function (PDF) of the signal-to-noise ratio (SNR) for the central beam of the VCSEL array system can be approximated as a uniform distribution. In addition, the average data rate of the central beam and its upper bound are given analytically and verified by Monte-Carlo simulations. For a multi-user scenario, an analytical upper bound for the average data rate is given. The effects of the cell size and the full width at half maximum (FWHM) angle on the system performance are studied. The results show that the system with a FWHM angle of $4^\circ$ outperforms the others.
翻译:光学无线通信(OWC)被认为是一个很有希望的技术,它将减轻移动设备数量不断增加造成的交通负担。在本研究中,为室内OWC系统提出了一个新的垂直光度表面发射激光(VCSEL)阵列。为移动用户启动最佳光束,为系统提出了两种光束激活方法。基于角立方反射器(CCCR)的方法为高速用户提供了非常低的延缓度,并允许实时激活。其他方法使用全向发射机(ODTTx)。ODTx可以达到上行链传输和同时激活波音的角值。此外,ODTFx的系统对于用户设备(UE)的随机定向非常强。为拟议的VCSEL阵列系统进行了系统水平分析。对于单个用户而言,信号到音频率比的概率(PDFDF)可以被比为VCSEL阵列系统(ODT)。ODSER阵列系统(Oright)可以比近为统一分布式。此外,ODDFL阵列阵列阵列阵列系统的最大范围分析范围分析结果是用于分析的上层分析,其上值分析的上限分析结果的上,其上,其上端分析的上,其上值是分析的上值为分析的上值平均分析的上值。